A Novel Alkaloid from Aspidosperma pyricollum (Apocynaceae) and Complete 1H and 13C Chemical Shift Assignments

A novel natural product indole, alkaloid, named rel-pyricolluminol (1), was isolated from Aspidosperma pyricollum Mull.Arg. together with six known metabolites sitsirikine (2), aparicin (3), ulein (4), stemmadenine (5), lupeol (6), and (3)-sitoster-3-yl -D-glucopyranoside (7). These compounds were characterized on the basis of their spectral data, mainly 1D- (H-1,C-13-DEPTQ) and 2D-NMR (H-1,H-1-COSY, NOESY, HSQC, and HMBC), and mass spectra (EI-MS and HR-ES-MS), involving also comparison with data from the literature.